20420430 has 16 divisors (see below), whose sum is σ = 49009104. Its totient is φ = 5445440.

The previous prime is 20420377. The next prime is 20420443. The reversal of 20420430 is 3402402.

It is a happy number.

It is a super-2 number, since 2×20420430² = 833987922769800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 340311 + ... + 340370.

It is an arithmetic number, because the mean of its divisors is an integer number (3063069).

Almost surely, 2^20420430 is an apocalyptic number.

20420430 is an abundant number, since it is smaller than the sum of its proper divisors (28588674).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20420430 is a wasteful number, since it uses less digits than its factorization.

20420430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 680691.

The product of its (nonzero) digits is 192, while the sum is 15.

The square root of 20420430 is about 4518.8969893106. The cubic root of 20420430 is about 273.3306249319.

Adding to 20420430 its reverse (3402402), we get a palindrome (23822832).

The spelling of 20420430 in words is "twenty million, four hundred twenty thousand, four hundred thirty".